Fig. 2

Frequency distribution of scores of the forest structural diversity index (FSI) for the second (NFI2002) (left, mean = 0.18) and third (NFI2012) national forest inventory (right, mean = 0.21). Scores were calculated for 12.918 inventory plots within Baden-Württemberg. Differences between NFI2002 and NFI2012 are significant for an applied confidence level of 0.95